ut181a 0.2.1

Uni-T UT181A DMM remote control
Documentation 
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use chrono::{NaiveDate, NaiveDateTime};

use error::*;

pub(crate) fn read_stringz(data: &[u8]) -> String {
    let zestr: Vec<u8> = data.into_iter().cloned().take_while(|&b| b != 0).collect();
    String::from_utf8_lossy(&zestr).into_owned()
}

/// Read `DateTime` from bytes.
pub(crate) fn read_datetime(data: &[u8]) -> Result<NaiveDateTime> {
    let year = 2000 + (i32::from(data[0]) & 0x3F);
    let month = (u32::from(data[0]) >> 6) | ((u32::from(data[1]) & 0x03) << 2);
    let day = u32::from(data[1] >> 2) & 0x1F;

    let hour = (u32::from(data[1]) >> 7) | ((u32::from(data[2]) & 0x0F) << 1);
    let minute = (u32::from(data[2]) >> 4) | ((u32::from(data[3]) & 0x03) << 4);
    let second = u32::from(data[3]) >> 2;

    match NaiveDate::from_ymd_opt(year, month, day) {
        None => Err(ErrorKind::InvalidDateTime(year, month, day, hour, minute, second).into()),
        Some(date) => match date.and_hms_opt(hour, minute, second) {
            None => Err(ErrorKind::InvalidDateTime(year, month, day, hour, minute, second).into()),
            Some(datetime) => Ok(datetime),
        },
    }
}

pub(crate) fn allowed_char(c: char) -> bool {
    (c as u32) >= 0x20 && (c as u32) <= 0x7E
}